package org.smart4j.chapter2.util;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class PropsUtil {
    private final static Logger LOGGER =LoggerFactory.getLogger(PropsUtil.class);

    /*
     * 加载属性文件
     *
     */
    public static Properties loadProps(String fileName) {
        Properties props=null;
        InputStream is=null;
        try {
            is=Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if(is==null) {
                throw new FileNotFoundException(fileName+"file is not found");
            }
            props=new Properties();
            props.load(is);
        }catch(IOException e) {
            LOGGER.error("load properties file failure",e);
        }finally {
            try {
                is.close();
            } catch (IOException e) {
                LOGGER.error("close input stream failure",e);
            }
        }
        return props;
    }

    /*
     *
     * 加载字符型属性（默认空字符串）
     */
    public static String getString(Properties props,String key) {
        return getString(props,key,"");
    }

    public static String getString(Properties props, String key, String defalutValue) {
        String value=defalutValue;
        if(props.contains(key)) {
            return props.getProperty(key);
        }
        return value;
    }

    /*
     * 加载数值型属性（默认值 0）
     */
    public static int getInt(Properties props,String key) {
        return getInt(props,key,0);
    }

    public static int getInt(Properties props, String key, int defaultValue) {
        if(props.contains(key)) {
            return CastUtil.castInt(props.get(key));
        }
        return defaultValue;
    }

    /*
     * 加载布尔型属性（默认为 false）
     *
     */
    public static boolean getBoolean(Properties props,String key) {
        return getBoolean(props,key,false);
    }

    public static boolean getBoolean(Properties props, String key, boolean b) {
        boolean value=b;
        if(props.contains(key)) {
            value=CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }


}

